Karen, you're definitely not alone and I guess selfishly, I was glad to read your post and some of the replies as we've had a similar time with Baxter, now 20 weeks.
We got to the point of contacting the breeder to come and observe to make sure we weren't over-reacting although he then started teething so the biting slowed down a lot for a little while. We re-read all our puppy books, scoured this site, talked to people and just got very confused as we'd done everything suggested, consistently! While some of Baxter's biting was the usual puppy play biting, at other times if he got hold and didn't want to let go, we were literally having to prise his jaws off my legs or arms as he would clamp down and nothing would make him stop. He was consistently breaking my skin to bleeding point and I was covered in bruises as a result and very down about not being able to enjoy time with our puppy. This was happening even though we followed all the advice on diverting, distracting, mental stimulation etc. He has plenty of kongs, we play 'find it', off lead walks, the lot. He had him vet checked too just in case.
We're not over it by a long shot and still have the occassional blip usually when he's overexcited, over frustrated etc. At home he has a pen and a crate which has helped, mainly what's worked has been to have him on his lead whenever he's out of his pen which feels a bit rubbish to not have him able to roam free in the apartment with us but prevention has definitely helped reduce it. This means that if we're having some clicker training, his lead stays on, grooming and handling, lead is on, general bit of play, lead on. Obviously we hope he starts to completely forget this behaviour or learn he doesn't get the same levels of contact with us as he gets older and in every other way he's a funny, wriggly cocker puppy that we love to bits.
Good luck to all of you with little cockerdiles, and thanks to those who posted on this, I think I finally feel like it will eventually end
